Wildfire Fuels and Fuel Reduction

Kelsi Bracmort
Specialist in Agricultural Conservation and Natural Resources Policy

Severe wildfires have been burning more acres and more structures in recent years. Some assert that climate change is at least partly to blame; others claim that the increasing number of homes in and near the forest (the wildland-urban interface) is a major cause. However, most observers agree that wildfire suppression and historic land management practices have led to unnaturally high accumulations of biomass in many forests, particularly in the intermountain West. While high-intensity conflagrations (wildfires that burn the forest canopy) occur naturally in some ecosystems (called crown-fire or stand-replacement fire ecosystems), abnormally high biomass levels can lead to conflagrations in ecosystems when such crown fires were rare (called frequentsurface- fire ecosystems). Thus, many propose activities to reduce forest biomass fuels.

The characteristics of forest biomass fuels affect the nature, spread, and intensity of the fire. Fuel moisture content is critical, but is generally a function of weather patterns over hours, days, and weeks. Fuel size is also important—fine and small fuels (e.g., needles, grasses, leaves, small twigs) are key to fire spread, while larger fuels (e.g., twigs larger than pencil-diameter, branches, and logs) contribute primarily to fire intensity; both are important to minimizing fire damages. Fuel distribution can also affect damages. Relatively continuous fuels improve burning, and vertically continuous fuels—fuel ladders—can lead a surface fire into the canopy, causing a conflagration. Total fuel accumulations (fuel loads) also contribute to fire intensity and damage. Thus, activities that alter biomass fuels—reducing total loads, reducing small fuels, reducing large fuels, and eliminating fuel ladders—can help reduce wildfire severity and damages.

Several tools can be used to reduce forest biomass fuels. Prescribed burning is the deliberate use of fire in specific areas under specified conditions. It is the only tool that can eliminate fine fuels, but is risky because it burns any fuel available. Wildland fire use is the term used for allowing a wildfire to be used like a prescribed burn (i.e., within specified areas and conditions). Thinning is a broader forestry tool useful for eliminating fuel ladders and total fuels in the crown, but it does not eliminate fine fuels, and it concentrates fuels in a more continuous array on the surface. The combination of thinning with prescribed burning is often proposed to combine the benefits, but it also combines the cost of both. Logging does little to reduce fuel loads.

The federal land management agencies undertake all of these activities under general authorities for wildfire protection and land and resource management. Fuel reduction, primarily via prescribed burning, is funded with direct annual appropriations for wildfire management. Other activities, particularly thinning, are funded through other annual appropriations accounts, such as vegetation management. Also, several mandatory spending accounts provide funds for related activities, such as treating logging and thinning debris. In addition, wildfire assistance funding allows the Forest Service to provide technical and financial aid for reducing forest biomass fuel loads on nonfederal lands, among other things.

The issues for Congress include the appropriate level of funding for prescribed burning and thinning for fuel reduction and the appropriate reporting of accomplishments. Current reporting does not identify ecosystems being treated and the effectiveness of the treatments. Similarly, current appropriations and reporting do not distinguish thinning for fuel reduction from thinning for other purposes, such as enhancing timber productivity. More complete reporting could allow Congress to better target its appropriations for fuel reduction to enhance wildfire protection.


Date of Report: May 13, 2013
Number of Pages: 18
Order Number: R40811
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Agriculture-Based Biofuels: Overview and Emerging Issues

Randy Schnepf
Specialist in Agricultural Policy

Since the late 1970s, U.S. policymakers at both the federal and state levels have authorized a variety of incentives, regulations, and programs to encourage the production and use of agriculture-based biofuels—i.e., any fuel produced from biological materials. Initially, federal biofuels policies were developed to help kick-start the biofuels industry during its early development, when neither production capacity nor a market for the finished product was widely available. Federal policy (e.g., tax credits, import tariffs, grants, loans, and loan guarantees) has played a key role in helping to close the price gap between biofuels and cheaper petroleum fuels. Now, as the industry has evolved, other policy goals (e.g., national energy security, climate change concerns, support for rural economies) are cited by proponents as justification for continuing or enhancing federal policy support.

The U.S. biofuels sector responded to these government incentives by expanding output every year from 1980 through 2011 (with the exception of 1996), with important implications for the domestic and international food and fuel sectors. Production of the primary U.S. biofuel, ethanol (derived from corn starch), has risen from about 175 million gallons in 1980 to nearly 14 billion gallons in 2011. U.S. biodiesel production (derived primarily from vegetable oil), albeit much smaller, has also shown strong growth, rising from 0.5 million gallons in 1999 to a record 969 million gallons in 2012. Despite the rapid growth of the past decades, total agriculture-based biofuels consumption accounted for only about 8% of U.S. transportation fuel consumption (9.7% of gasoline and 1.5% of diesel) in 2012.

Federal biofuels policies have had costs, including unintended market and environmental consequences and large federal outlays (estimated at $7.7 billion in 2011, but declining to $1.3 billion in 2012 with the expiration of the ethanol blender’s tax credit). Despite the direct and indirect costs of federal biofuels policy and the relatively small role of biofuels as an energy source, the U.S. biofuels sector continues to push for federal involvement. But critics of federal policy intervention in the biofuels sector have also emerged. Current issues and policy developments related to the U.S. biofuels sector that are of interest to Congress include:

• Many federal biofuels policies require routine congressional monitoring and occasional reconsideration in the form of reauthorization or new appropriations.

• The 10% ethanol-to-gasoline blend ratio—known as the “blend wall”—poses a barrier to expansion of ethanol use. The Environmental Protection Agency (EPA) issued waivers to allow ethanol blending of up to 15% (per gallon of gasoline) for use in model year 2001 and newer light-duty motor vehicles. However, the limitation to newer vehicles, coupled with infrastructure issues, could limit rapid expansion of blending rates.

• The slow development of cellulosic biofuels has raised concerns about the industry’s ability to meet large federal usage mandates, which in turn has raised the potential for future EPA waivers of mandated biofuel volumes and has contributed to a cycle of slow investment in and development of the sector.

In 2012, the expiration of the blender tax credit, poor profit margins (due primarily to high corn prices), and the emerging blend wall limitation have contributed to a drop-off in ethanol production and have generated considerable uncertainty about the ethanol industry’s future.


Date of Report: May 1, 2013
Number of Pages: 44
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Animal Agriculture: Environment

A selected collection of Congressional Research Service studies expanded by Penny Hill Press through content selection and hyperlink activation.


Date of Report: May 9, 2013
Number of Pages: 122
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Animal Agriculture: Food Safety

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Date of Report: May 9, 2013
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Animal Agriculture: Dairy, Livestock And Poultry Markets

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Date of Report: May 8, 2013
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